礼貌，并不需要花钱。用完马桶后，把马桶盖放下；上电梯时，耐心等别人出来再进去；把购物车放回指定区域；在借东西时，归还时要东西的状态要比你借的时候还要好（例如给车加满油、把物品清理干净）。

Success in farming comes from understanding nature, not fighting it.

Innovation is seeing what everybody has seen and thinking what nobody has thought.

Fear is inevitable, I have to accept that, but I cannot allow it to paralyze me.

I want my fans to know how much I appreciate them.

I never guess. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.

数学的美只对那些更有耐心的追随者展现。